/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ai.h2o.sparkling.repl

import java.util.Scanner

/**
  * Interpreter classloader which allows multiple interpreters to coexist
  */
class InterpreterClassLoader(val fallbackClassloader: ClassLoader) extends ClassLoader {

  override def loadClass(name: String): Class[_] = {
    if (name.startsWith("intp_id")) {
      val intp_id = new Scanner(name).useDelimiter("\\D+").nextInt()
      H2OIMain.existingInterpreters(intp_id).classLoader.loadClass(name)
    } else {
      fallbackClassloader.loadClass(name)
    }
  }
}
